T1 Client Copy Email

The T1 Client Copy Email refers to a field called ESign. It has 2 sets of codes with text in between ({{^ESign}}…{{/ESign}}{{#ESign}}…{{/ESign}}. I can’t find this field to use the template how it was created. Anyone know what field this is referring too?

I know I can edit this and find a different way to make it work, but I would like to stick to the default if possible.